Delete row ('257', '20731') from daily_volatility

ticker_id 257
day 20731
implied_open 0.4555983757653225
implied_high 1.14772691873982
implied_low 0.4000375982329661
implied_close 0.4127372045260762
historical_open 0.2047811514763993
historical_high 0.2047811514763993
historical_low 0.2047811514763993
historical_close 0.2047811514763993
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